v1.1 tweaks + binaries

tiny update! changes:

• score cannot go below zero (that’s just no fun, and this change shouldn’t be relevant to people trying for high scores anyway)
• smaller button code
• bugfix: the old code checked if b>8 to skip the rest of the current level. this meant the level would skip if you pressed down and any other button! (e.g. down+right on the same frame means b=8+2=10, and so b>8. oops!) now, it properly only catches z/x by checking for b>15
• binaries are now available to download ($1 or claim on patreon)